What are the best xbox 360 games to play on Xbox live?

I have xbox 360 and I was wondering what games would be the best to play on xbox live.What are the best xbox 360 games to play on Xbox live?
Call of duty 4

call of duty world at war

Gears of war 2

Halo 3

Mortal Kombat Vs DC UniverseWhat are the best xbox 360 games to play on Xbox live?
Call of Duty World at War

Gears of War 2

Gears of War

Call of Duty 4

Halo 3

Burnout Paradise

NHL 09

NBA 09What are the best xbox 360 games to play on Xbox live?
paradice burn out and full auto